Using interrupts with Kaby Lake Sunrise Point GPIO driver

Hope someone can help !

I'm using 4.11.12 on Fed 25, with a C236 PCH.  pinctrl_sunrisepoint & pinctrl_intel modules are loaded.

I can use /sys/class/gpio/export and friends to do I/O, but I need interrupts also.

Echoing for ex. "both" to gpio475/edge causes these to appear in /proc/interrupts:

  14:          0          0          0          0          0          0          0          0  IR-IO-APIC   14-fasteoi   INT345D:00

292:         0          0          0          0          0          0          0          0  intel-gpio  155  gpiolib

But setting it as input and toggling it generates no interrupts. I also tried the C code here:

https://developer.ridgerun.com/wiki/index.php?title=Gpio-int-test.c

but I never see the interrupt counts increment...

Ultimately I must create a driver with my own interrupt service rtn, but it would be great

to get this working first.

Thanks in advance,

Martin